# GetFunctionConcurrency
<a name="API_GetFunctionConcurrency"></a>

Returns details about the reserved concurrency configuration for a function. To set a concurrency limit for a function, use [PutFunctionConcurrency](API_PutFunctionConcurrency.md).

## Request Syntax
<a name="API_GetFunctionConcurrency_RequestSyntax"></a>

```
GET /2019-09-30/functions/FunctionName/concurrency HTTP/1.1
```

## URI Request Parameters
<a name="API_GetFunctionConcurrency_RequestParameters"></a>

The request uses the following URI parameters.

 ** [FunctionName](#API_GetFunctionConcurrency_RequestSyntax) **   <a name="lambda-GetFunctionConcurrency-request-uri-FunctionName"></a>
The name or ARN of the Lambda function.  

**Name formats**
+  **Function name** – `my-function`.
+  **Function ARN** – `arn:aws:lambda:us-west-2:123456789012:function:my-function`.
+  **Partial ARN** – `123456789012:function:my-function`.
The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.  
Length Constraints: Minimum length of 1. Maximum length of 140.  
Pattern: `(arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}((-gov)|(-iso([a-z]?)))?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?`   
Required: Yes

## Request Body
<a name="API_GetFunctionConcurrency_RequestBody"></a>

The request does not have a request body.

## Response Syntax
<a name="API_GetFunctionConcurrency_ResponseSyntax"></a>

```
HTTP/1.1 200
Content-type: application/json

{
   "ReservedConcurrentExecutions": number
}
```

## Response Elements
<a name="API_GetFunctionConcurrency_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [ReservedConcurrentExecutions](#API_GetFunctionConcurrency_ResponseSyntax) **   <a name="lambda-GetFunctionConcurrency-response-ReservedConcurrentExecutions"></a>
The number of simultaneous executions that are reserved for the function.  
Type: Integer  
Valid Range: Minimum value of 0.

## Errors
<a name="API_GetFunctionConcurrency_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** InvalidParameterValueException **   
One of the parameters in the request is not valid.    
 ** message **   
The exception message.  
 ** Type **   
The exception type.
HTTP Status Code: 400

 ** ResourceNotFoundException **   
The resource specified in the request does not exist.  
HTTP Status Code: 404

 ** ServiceException **   
The AWS Lambda service encountered an internal error.  
HTTP Status Code: 500

 ** TooManyRequestsException **   
The request throughput limit was exceeded. For more information, see [Lambda quotas](https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html#api-requests).    
 ** retryAfterSeconds **   
The number of seconds the caller should wait before retrying.
HTTP Status Code: 429

## See Also
<a name="API_GetFunctionConcurrency_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/lambda-2015-03-31/GetFunctionConcurrency) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/lambda-2015-03-31/GetFunctionConcurrency)